Core-drill bit



Aug, 26, 1924.

C. C. HANSEN CORE DRILL BIT Filed Feb. 1, 1923 INVENTOR Cfimdes (7 Hermie/1 m5 ATT NEY Patented Aug. 26, lg lo untrue stares ant onAnLEs c. HANSEN, or EASTON, PENNSYLVANIA, ASSIGNOR ro rnennsonn-nnnn COMPANY, or JERSEY crrv, NEW JERSEY, a oonrona'rron on NEW aErs/sEY.

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Application filed February 1, 1928. Serial No. 616,310.

To all whom it may concern:

Be' it known that T, CHARLES C. HANSEN, a citizen of the United States, and a resident of Easton, county of Northampton, State of Pennsylvama, have in'vented certain Core,

Drill Bits, of which the following is a specification accompanied by drawings.

This invention relates to core drills, and particularly to the rotary cutting bits forming a part of such drills. One type of core drill which possesses certain advantages due to its ability to drill holes at any angle is the so-called diamond drill. This type of core drill is adapted to use black diamonds or carbons as the cutting medium, and these diamonds are usually mounted in the end of the rotary cutting bit. The proper setting of the stones in the end of the bit is a matter of difiiculty and it is particularly diflicult to properly reset or replace stones which have become loosened or lost.

. One object of this invention is to enable the cutting elements of a coredrill of the above type to be set in individual cutter pins or mountings, so that comparatively inexpensive chips or small pieces of diamonds may be used and the mountings containing the cutting elements will be detachably secured in the end of the rotary cutting bit. A further object is to position the cutter pins or mountings so that they will perform their work most eiiectively. A still further and most important object is to firmly secure the cutter pins within the end of the bit p against longitudinal or rotative movement by positive locking means which eliminate I the use of separate looking or securing devices.

With the above and other 0b18CtS 1n view my invention consists in the features of construction and operation set forth in the following specification and illustrated on the accompanying drawing, forming a part hereof.

Figure l is a sectional elevation of the bit end of a core drill, showing a preferred form of the present invention; 7

Figure 2 is a side view, partly in section, or the cutting end of the bit;

Figure 3 is an end face view of the cut ting end of the bit;

Figure 4 is an enlarged perspective view of one of the detachable cutter points showing a modification of the securing groove.

Referring to the drawings, ll have illustrated the bit end of a typical diamond drill, including a hollow cylindrical core barrel A, one end of which is adapted to be 101ned to a so-called calyx barrel B by D adapted to be threaded to. the core barrel A as shown at E. The usual hollow drill rod F is adapted to be threaded in the plug C and the plug C has an axial bore G communicating with the interior of the core barrel A, so that liquid may be forced under pressure through the drill rod F, plug C, core barrelA, and bit D to the cutting end H of the bit D to facilitate th'e cutting of the core J in a manner which is well known.

The end surface Sr of the bit l) is provided with a longitudina ly extendin K, which holes may be Tocated at any suit able angle so that the cylindrical cutters or pins L which are inserted in the holes K may be inclined to the proper degree for satisfactory cutting during the rotation of the bit D. In the present instance the holes K, and hence the cutter pins L have referably been positioned in three series. 11 one series indicated at Q, the holes K are positioned so that the ends of the cutter pins are located substantially at the center of the end face of the bit, the holes for the cutter ins of this series being preferably parallel with the longitudinal axis of the bit. In the second series, indicated at P, the holes K are inclined diametrically inwardly at an angle tothe longitudinal axis of the bit, and

in the third series, indicated at- Q, the holes are inclined diametrically outwardl at substantiall the same angle. The en 5 of the cutter pins L are provided with the cutting material U, which may be diamond or some other substance, set into the ends of the cutter pins L in any suitable manner.

The cutter pins are each provided with a locking notch R intermediate the length of the pin. This notch R is preferably formed relatively close to the outer end of the cutter pin and may be substantially aligned with the end face of the bit when the cutter pin has been inserted in the hole K, as indicated at R in Figure 2, or a relatively short distance from the end of the bit as indicated at P in Figure 2. The notch B may be formed with lurality of series of generally cylindrical holes I straight end surfaces S as shown in Figure 4, or inclined end surfaces T as seen in Figure 2. The cutter pins L are firmly secured in the holes K by driving or forcing the metal of the body of the bit from the end face of the bit at a point V adjacent to the cutter pin into the notches with a chisel W or other suitable tool so that the force of the blow displaces the metal and causes it to flow into the notches and form locking keys. When thus secured the cutter pins are rigidly heldagainst longitudinal and rotative movement. The cutter ins may be removed from the bit when desired by drivin a narrow chisel or other small suitably shaped implement alongside the cutter pin L so that the metal holding the pin is chipped ofi or otherwise removed from the A rotary cutting bit for a core drill, having removable cylindrical cutter pins inserted in longitudinally extending holes in the end face of the bit, each pin having a locking notch intermediate its length, and the metal of the body portion of the bit being driven or forced from the end face of the bit into said locking notches to form looking ke s to hold the pins in place and prevent t em from turning during operation of the bit.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

